Water-tube steam-generator.



A. G. BURKHARDT. WATER TUBE STEAM GENBRATDR.

APPLIUATION FILED JUNBQ, 1910. 1

Patenelug. 16, 1910.

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A. G.,BHRKHARDT. WATEBTUBE STEAM GENERATOR.

APPLICATION FILED JUNE 9, 1910.

Patented Aug. 16, 1910.

2 SHEETS-SHBET 2.

25 culating tubes.

AUGUST GOTTLOB BURKHARDT, F DUSSELDORF, GERMANY'.

WATER-TUBE STEAM-GENERATOR.

anatre.

` Specification of Letters Patent.` Patented Anil', 16, l1910.

Application led June 9, 1910. Serial 'No'. 566,084.

To ou wftom 'tt mail] concern:

B e it known that l, AUGUST Gor'rno BURKHARDT, engineer, a citizen ofthe Einvpire' of Germany, residing at Dusseldorf,

108. Gartenstrasse, have invented certain new and useful Improvements inor Relating to `Water-Tube Steam-Generators, of'4 which the following isa full, clear, and eX- act description. l

i My invention relates to `water-tube steam,

generators of the type wherein two horizontal Water drums disposed inthe lower part of the generator are cross-connected by diagonally'arrangedl banks of generating tubes to upper steam and waterdrurns, cir

culating tubes also connecting each steam drum with the water drumdirectly below it.

According to my invention the heating gases are divided byA bullies intotwo currents which flow, separately through Veach bank of generatingtubes and rejoin at the point where the banks of tubes cross oneanlother, being then separated again to liow 'through the two groups ofdescending cir If desired, the heating rases then flow upward throughtubular feed-water heaters which may also form the outer walls of theflue for the heating gases.

A construction of wateitube steam gencrater according to my invention isillustrated by way of example in the accom- `panying drawings, in whichsimilar reference letters denote similar parts.

Figure l is a Vertical section on the line 1-1 of Fig. 2, Fig. 2 is avertical section on the line 2-2 ot Fig. l, and Fig. 3 is a.

plan showing two different forms of feedwater-heater.

The generator illustrated is provided with both a fiat grate P ofordinary construe tion and also a stepped grate T so that the generatorcan be supplied with fuel simultaneously from both sides, steam coalbeing burned on the grate l? and soft or brown i5 coal on the steppedgrate T.

The steam and water `drums A1, A2 arranged in the upper portion of thegenerator are cross-coimected to the lower water drums B1, B2 by banksof generating tubes o G1, C1, the two banks of tubes crossing oneanother in the manner shown. Since the generating tubes are exposed tothe hottest gases, generation of steam takes place for the most partwithin the tubes. To return any water which may rise in the generatingtubes C1, C2 in the shortest and easiest man- `to the arrangement ofdescending circulating tubes, water from one bank. of generat` ing tubesC1 is carried by the shortest route to the water drum B2 and thence intothe vother groupof generating tubes C2 so that,

if the banks of generating tubes are heated to an unequal extent, thecirculation of water is equalized. 4

The heating gases are compelled to flow in two oblique paths by means ofbaiiie plates J and K, the plates J extending downward from the point atwhich the banks of generating tubes erossfone another parallel to thesetubes 'thus forming a roof which forces the heating gases to flowbetween and parallel to the generating tubes, the outer ones of 'whichcarry the baliie plates K and extend downward to the water drums B1, B2,the distance between the baffles K and J' being about equal to that ofthe width of each bank of tubes. The heating gases are thus divided intotwo currents which llow through the generating tubes and rejoin at thepoints Vwhere these tubes cross one another. Owing to the area of thepassage through which the gases flow being considerably reduced by thecrossing of the generating tubes, the heating gases make contact withthewalls of the tubes in a very thorough manner resulting in an eliicientgeneration of steam. After rejoining in the manner described, the twocurrents of heating gases again separate and flow down-- ward betweenthe outer surfaces of the baille lates K and the inner-surfaces of theother battle plates L extending from the steam and water drums A1, A2parallel to, and ter1ninating within a short distance of the lower endsof the circulating tubes D1, D1. Finally the heating gases 'How upwardthrough two groups of tubes F containing feed-water whichflows downwardin the opposite direction to the heating gases whfch` pass upwardbetween these tubes and escape intor the main flue and chimney. .A l

The feed-waterheater- `tubes extend' from the end walls S of thegenerator to the superheatei 'ehiiiber M, `in this way covering theouter walls of the actual heating iuesof the generator as shown on theleft hand side of Fig. 3. Alternatively, the feed Water de- Vice may bedisposed soas to cover also the .outer wall of the superheater chamber Fin which case verticalvpartitions Z are disposed between the feed-watertubes and lsuperheater 4chamber as shown lon the right hand side of Fig. 3. Owing to the feed-waterheater tubes being arranged on the outerside of the brickwork of the generator, these tubes are easilyaccessible for cleaning purposes and at the same time readily take upheat radiating from the inner lines.

As shown in Fig. 2 of the drawings, if desired, a superheater U may bedisposed in an intermediate chamber and also in the chainbers bounded bythe baiile plates K andL. The heating gases then enter through lateralopenings V and escape at the top through openings W provided withregulating dainpers R.

What I- claim is 1. In a water-tube steam generator, the combinationwith steam and water drums arranged in the upper part of the generator,water-drums, arranged in the lower part of. the generator, banks ofgenerating tubes crossing one another, lateral circulating tubes, bothset of tubes connecting the upper and lower drums, and a furnace forgenerat- .ing heating gases, of bullies" dividing the heat-ing gasesinto two currents which rcjoin at the crossing point of said generatingtubes, both set of tubes connecting the upper and lower drums, and afurnace for generating heating gases, of baies dividing lt-he heatinggases into two currents which rejoin at the crossing point of saidgenerating tubes and then separate again so as to flow down between thesaid circulating tubes, of baffles arranged near the outer surface ofthe circulating tubes and leading the heating gases, after having passedthe circulating tubes, upward so as to sweep along feedwater-heatertubes forming the outer walls of the heating gas dues.

In testimony whereof I hereunto affix my signature in the presenceof twowitnesses. AUGUST eo'rTLoB uiunnaii'i. [1.. a] Witnesses CHAs. J.VVnioH'r, O'r'ro KNIG.

